Tricky aren't they?!
I find neglect and a poor memory works best for Hellebores. I sow fresh seed in trays and put them in a neglected corner for a couple of years, they need cold spells to trigger germination when it warms up. I sowed a tray a couple of years ago from purchased seeds, and have two surviving seedlings, just about ready to be potted on now! I have patience, but TBH I don't think I would bother again.
I expanded my collection by waiting until early summer when the garden centres are getting rid of their stock once its flowered and set seed pods, I got a trolley full for less than £30, and some of the big plants were originally selling for £15 each! Planted them out and they all flowered brilliantly the following year, still going strong.